B08_GRSM_158579_202623_Solit_Attach_10_CROMTankInspectionReport_081820.pdf

TANK INSPECTION REPORT

U.S. DEPARTMENT OF THE INTERIOR NATIONAL PARK SERVICE

LOOK ROCK CAMPGROUND

100,000-GALLON GROUND STORAGE TANK

TALLASSEE, TENNESSEE

CCR Job No. 2020-R-031

Inspection Performed on May 28, 2020

1. Inspection Report Sheets 1 – 5

2. Inspection Report Pictures Sheets 6 – 17

3. Field Notes Sheets 18 – 20

Talmadge B. Mincey, PE

Tennessee License Number: 115800

CROM, LLC

250 SW 36th Terrace Gainesville, Florida 32607

This item has been electronically signed and sealed by Talmadge B.

Mincey, PE on 6/19/20 using a Digital Signature. Printed copies of this document are not considered signed and sealed and the signature must be verified on any electronic copies.

100,000 Gallon Tank Inspection Report May 28, 2020 Look Rock Campground, Tennessee 1

CCR003 – 12/12/2019

TANK INSPECTION REPORT

1.0 Executive Summary

CROM Coatings and Restorations (“CCR”), a Division of CROM, LLC, conducted an inspection of the 100,000-Gallon Ground Storage Tank (GST) in Tallassee, Tennessee on May 28, 2020. The goal of the inspection was to review the status of the tank, the structural and coating integrity, and to determine what measures, if any, are necessary to bring the tank up to present codes and standards so that the longest useful life of the tank can be realized. Jason Bossier, CCR Project Manager, performed the inspection and prepared this report under the review of Talmadge Mincey, P.E.

The tank is in good structural condition at this time. The tank had a bladder system installed at some point after the original construction. CCR removed this bladder to evaluate the interior tank wall and floor. Several issues were discovered by the inspector which should be addressed.

· Deteriorated coatings and bio-growth on sidewall exterior (Figures 1,2,3, and 4)

· Deteriorated concrete on the inside of the manhole (Figures 3, 4, 5, 6, and 7)

· Deteriorated protective gel coat on the fiberglass hatch cover (Figures 8, and 9)

· Deteriorated protective gel coat and staining on exterior dome hatch cover. Also there is not a rubber sealant on the interior of the hatch cover (Figures 31, 32, and 41)

· Holes in shotcrete corewall sidewall where interior bladder was removed (Figures 10, 11, 12, 13, 14, 15, and 16)

· Delaminated and hollow shotcrete along cracks on the interior corewall (Figures 10, 11, 12, 13, 14, 15, and 16)

· Broken pipe bracket for the 6” Cast Iron Overflow Pipe (Figures 13 and 14)

· Unknown interior bladder sealant on interior dome, overflow pipe, and pipe brackets (Figures 13, 16, and 18)

· Cracking on the underside of the dome roof (Figure 17)

· Cracking, previously repaired cracks, and holes from the interior bladder on the floor (Figures 18, 19, and 20)

· Liquid level indicator float bracing is not attached to the floor, and the wire has become detached from the float (Figures 25 and 26)

· Interior ladder brackets are covered with the unknown interior bladder sealant (Figure 27)

· Unknown device in center vent curb, and the fiberglass center vent is missing (Figures 33 and 34)

· Cracks and spalling present on the exterior dome (Figures 33, 35, 36, 37, 38, 39, 40 and 41)

· Corrosion present on the exterior ladder (Figures 1, and 42)

· No safety handrails present around the dome hatch (Figure 41)

· No safety tie offs present on the dome (Figure 37)

· No mudsill present around inlet-outlet pipe and sump (Figure 15)

The complete findings from the tank inspection are detailed in Section 3.0 Conclusions and Recommendations.

2.0 Scope of Work

The purpose of the inspection was to investigate the structural and coatings integrity of the 100,000-Gallon Ground Storage Tank. Built in 1964 and designed to meet the construction standards for a prestressed concrete tank of that era. The investigation included the interior and exterior walls of the tank, the dome, floor

Look Rock Campground, Tennessee 2 and tank accessories. The inspection was a visual survey of the structure, and it was inspected in accordance with AWWA D110 and ACI 350 to evaluate the present condition of the tank structure.

Tank Details:

100,000 Gallon Reservoir 35’-0” ID x 14’-6” SWD (CROM Job No. 1964-M-016)

The tank was drained prior to the interior inspection or CCR personnel entering the tank. CCR used an ambient air monitor to test the quality of air within the tank prior to entry.

The exterior wall was observed for any deterioration, cracking, efflorescence, spalled concrete, signs of corrosion, or other indicators of existing problems. The walls were “sound tested” to determine if hollow spots (e.g., delamination, cover coat separation) have occurred beneath the surface.

The inspector was provided access to the dome roof. The concrete dome was inspected for any deterioration, cracking, efflorescence, spalled concrete, signs of corrosion, or other indicators of existing problems. Tank accessories were looked at to determine the extent of the weathering of the material and the condition of the bolts, fasteners and the screens. All penetrations were checked for signs of leakage into the tank. All areas of concern were noted and mapped in the inspector’s field notes.

The interior wall was observed for any deterioration, cracking, efflorescence, spalled concrete, signs of corrosion or other indicators of existing problems. Piping and internal accessories were checked for corrosion along with the condition of their supports, bolts, and anchors.

The tank was fully surveyed and a record was made of all observations. Photographs were taken as an additional record of the inspection.

3.0 Conclusions and Recommendations

The inspection of the 100,000-Gallon Ground Storage Tank in Look Rock Campground, Tennessee has been carried out in accordance with AWWA D110. The inspection of the prestressed composite tank at this location did not reveal any apparent problems that would cause concern for the structural integrity of the tank itself. However, there are items that should be addressed in order to avoid the possibility of future problems.

The report utilizes subjective terminology in regard to the condition of various elements of the structure. Items categorized as Excellent would be considered like new, no remedial action required; Good would indicate minor defects, still operable; Fair condition is used to describe an element or accessory requiring remedial action before the next scheduled 5-year inspection, and; Guarded/Poor condition would require immediate action.

(1) Tank Foundation: (N/A) Tank footer was buried under 6” of soil. From the tank interior the footer appears to be level and does not show signs of exterior gaps between the wall and the footer.

(2) Exterior Tank Wall: (Poor) Deteriorated coatings, cracks and bio-growth were noted on the exterior sidewall. (Figures 1, 2, 3, and 4). Recommend surface preparation to remove dirt, grease, delaminated coatings, and other contaminants from the surface. Abrasive blast exterior concrete surfaces to return surface back to shotcrete. Route all cracks greater than 1/64” wide and apply

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Tnemec Series 215 Surfacing Epoxy. Stripe coat crack repairs with Tnemec Series 156 Enviro-Crete.

Apply two coats of Tnemec Series 156 Enviro-Crete at 4-6 mils each coat to all exterior concrete surfaces.

CCR opened four (4) exploratory inspection holes to determine the condition of the prestressed wires at chosen areas of concern. The following results were found during the destructive investigation.

Inspection Hole Number

Number of Corroded Exposed Wires

Concrete Coverage

Picture File Figure

#1 0 out of 5 1" 43

#2 2 out of 11 1" 44

#3 2 out of 9 1" 45

#4 0 out of 11 1" 46

Note: When repairing exploratory inspection holes CCR applied Sika Armatec 110 EpoCem a cementitious epoxy to corroded wires before applying Sika VOH (Vertical and Overhead) cementitious repair mortar.

(3) Exterior Tank Dome: (Fair) Dome is only 2” thick and has delaminated coatings, spalling, cracks and bio-growth were all noted (Figures 35, 36, 37, 38, 39, and 40).

Note: In reviewing the drawings and evaluating the tank photos, it has come to our attention that the tank structure does not comply with the current industry code and Standard for potable water tanks (ACI 350-06, AWWA D110-04) with regards to dome thickness. The tank as currently constructed does meet minimum design criteria and is structurally sound; however, if modifications are ever performed on this tank, the local building department may require that it be brought up to meet the current standards. Please contact us if you have any questions regarding this note.

Recommend surface preparation to remove dirt, grease, delaminated coatings, and other contaminants from the surface. Abrasive blast exterior concrete surfaces to return surface back to shotcrete. Apply Sikadur 55 SLV a super low-viscosity penetrating sealer to all cracks. Apply two coats of Sika Top Seal 107 at 40 mils per coat. Apply two coats of Tnemec Series 156 Enviro-Crete at 4-6 mils each coat to all exterior concrete surfaces.

(4) Tank Floor: (Fair) Cracking, spalling, previously repaired cracks, and holes from the interior bladder on the floor were noted (Figures 18, 19, and 20). Recommend resurfacing damaged concrete surfaces with a cementitious repair mortar. Apply Sikadur 55 SLV a super low-viscosity penetrating sealer to all cracks. Apply two coats Sika TopSeal 107 cementitious waterproofing material at 40 mils per coat to the entire floor.

(5) Interior Tank Walls: (Fair) Inspector noted holes in corewall where the interior bladder was removed, delaminated concrete, hollow concrete and cracks on the interior corewall were also noted. (Figures 10, 11, 12, 13, 14, 15, and 16). Recommend resurfacing damaged concrete surfaces with Sika VOH

Look Rock Campground, Tennessee 4 cementitious repair mortar and applying two coats Sika TopSeal 107 cementitious waterproofing material at 40 mils per coat to the entire tank sidewall.

CCR opened four (4) exploratory inspection holes to determine the condition of the steel shell diaphragm at chosen areas of concern. The following results were found during the destructive investigation.

Inspection Hole Number

Condition of the Steel Diaphragm

Apparent Reason

Picture File Figure

#1 Good Minor Corrosion Staining

#2 Good Minor Corrosion Staining

#3 Compromised Significant corrosion resulting in penetration of diaphragm.

#4 Compromised Significant corrosion resulting in penetration of diaphragm.

(6) Interior Tank Dome: (Good) Cracks and unknown interior bladder sealant were noted on the interior dome (Figures 16 and 17). Recommend abrasive blast or hydro blast to remove interior bladder sealant. Repair all cracks with Tnemec Series 218 MortarClad.

(7) Dome Access Hatch: (Poor) Deterioration and discoloration of dome access hatch. Also corroded and missing hardware as well as missing rubber sealant was noted on the dome access hatch (Figures 31, 32, 41). Recommend replacement of access hatch cover.

(8) Dome Ventilator: (Poor) Missing fiberglass ventilator (Figures 33 and 34). Recommend replacing fiberglass ventilator.

(9) Exterior Ladder: (Poor) Delaminated coatings and corrosion were found on the exterior ladder.

(Figure 42). Recommend replacing existing exterior ladder with new aluminum ladder with lockable security door.

(10) Wall Manhole: (Poor) Concrete surfaces have become deteriorated (Figures 3, 4, 5, and 6).

Recommend resurfacing concrete with a cementitious repair mortar.

(11) Interior Piping: (Poor) Interior piping has unknown coating or sealant used on the interior bladder, and also has a broken pipe bracket (Figures 13 and 14). Recommend surface preparation and recoating the bottom pipe below the flange with Tnemec Series N140 Pota-Pox Plus, per the manufacturer recommendation. Replace top pipe above the flange with Schedule 80 PVC pipe. Also replacing the broken pipe brackets.

(12) Interior Ladder: (Poor) Interior ladder covered in unknown coating or sealant used on the interior bladder (Figures 27 and 28). Recommend replacing the existing interior ladder with a new fiberglass interior ladder.

Look Rock Campground, Tennessee 5

(13) Liquid Level Indicator: (Poor) Indicator float is not bolted to the floor, and the wire has become detached from the float (Figures 25 and 26). Recommend removing the existing liquid level indicator dome assembly, building a 4” perimeter curb and reinstalling a new liquid level indicator system.

Health department regulations typically call for openings on horizontal surfaces to have a minimum 4” lip with a cover having at least 2” turn down. Recommend removing the existing liquid level indicator dome assembly, building a 4” perimeter curb and reinstalling the liquid level indicator dome assembly.

(14) Dome Probe: (Fair) Dome probe does not have a concrete curb (Figure 39). Health department regulations typically call for openings on horizontal surfaces to have a minimum 4” lip with a cover having at least a 2” turn down. Recommend removing the existing dome probe and building a 4” perimeter curb with new PVC dome probe.

(15) Exterior Ladder Dome Landing: The exterior ladder landing on the dome is not secured with a safety handrail. As a result, inspectors, maintenance workers and other ladder users are not protected when climbing onto the dome. CCR recommends installing a handrail system around the perimeter of the dome.

(16) Inlet-Outlet Pipe: The 6” cast iron inlet-outlet pipe in the sump does not have a mudsill. Recommend installing a mudsill around sump.

Next Inspection: CCR recommends inspecting the tank by May 28, 2025 in accordance with AWWA, ACI 350.

The preceding report is submitted for your review and discussion. We would be pleased to discuss the results with you. If you have any questions or concerns, please do not hesitate to contact us.

Jason Bossier Project Manager

100,000-Gallon Tank Inspection Report - Pictures May 28, 2020 Look Rock Campground, Tennessee 6

CCR004 – 10/1/2018

Figure 1: Exterior sidewall Figure 2: Exterior sidewall

Figure 3: Exterior sidewall and manhole Figure 4: Exterior manhole deterioration

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Figure 5: Interior manhole Figure 6: Interior manhole deterioration

Figure 7: Pull up bar above manhole Figure 8: Manhole cover exterior

Look Rock Campground, Tennessee 8

Figure 9: Manhole cover interior Figure 10: Interior sidewall

Figure 11: Holes in sidewall from interior bladder Figure 12: Holes in sidewall from interior bladder

Look Rock Campground, Tennessee 9

Figure 13: 6” Cast Iron Overflow Pipe with one bracket detached from sidewall Figure 14: Pipe bracket detached from sidewall

Figure 15: 6” Cast Iron Inlet-Outlet Pipe and Sump Figure 16: Sidewall and dome. Material used to seal interior bladder on dome

Look Rock Campground, Tennessee 10

Figure 17: Interior dome Figure 18: Interior floor

Figure 19: Previously repaired cracks in the floor Figure 20: Holes from interior bladder in floor

Look Rock Campground, Tennessee 11

Figure 25: Liquid Level Indicator not attached to the floor Figure 26: Liquid Level Indicator detached wire

Figure 27: Interior ladder Figure 28: Interior of dome hatch

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Figure 29: Exterior of dome hatch Figure 30: Side view of exterior dome hatch

Figure 31: Exterior of dome hatch cover Figure 32: Interior of dome hatch cover

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Figure 33: Exterior dome, vent curb, and lightening ground equipment Figure 34: Aftermarket device in center vent

Figure 35: Cracks in exterior dome Figure 36: Spalling on exterior dome

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Figure 37: Spalling on exterior dome Figure 38: Cracks in exterior dome

Figure 39: PVC Dome Probe Figure 40: Liquid Level Indicator attached to dome

Look Rock Campground, Tennessee 15

Figure 41: Missing hinge for dome hatch cover Figure 42: Exterior ladder attached to dome

Figure 43: Exterior Destructive Investigation #1 prestressing wires

Figure 44: Exterior Destructive Investigation #2 prestressing wires. Minor corrosion present on 2 of

11 exposed wires.

Look Rock Campground, Tennessee 16

Figure 45: Exterior Destructive Investigation #3 prestressing wires. Minor corrosion present on 2 of the 9 exposed wires.

Figure 46: Exterior Destructive Investigation #4 prestressing wires

Figure 47: Finished patch over Exterior Destructive Investigation area

Figure 48: Interior Destructive Investigation #1 diaphragm. Minor corrosion and staining.

Look Rock Campground, Tennessee 17

Figure 49: Interior Destructive Investigation #2

Figure 50: Interior Destructive Investigation #3

Figure 51: Interior Destructive Investigation #4 diaphragm. Minor corrosion and staining

Figure 52: Finished patch over Interior Destructive Investigation area

TANK DETAILS

Location Owner Engineer Diameter (ft) 35'-0" 14'-6" Volume (gal) 100,000 Gallons Dome Inspector(s) Jason Bossier Shotcrete Inspection Date Thursday, May 28, 2020 1963-M-005

FOUNDATION YES NO COMMENTS

1 Is the tank backfilled? ü 6" Soil Backfill 2 Differential backfill? ü

3 Does the footer appear to be level? ü

4 Are there any gaps between the wall and the footer? ü

5 Is the footer undermined anywhere? ü

6 Is there a berm or sidewalk, splash pads? ü

Additional Comments:

PIPING YES NO COMMENTS

1 Is there a separate inlet and outlet pipe? ü 6" Cast Iron Inlet-Outlet Pipe 2 Are the inlet & outlet pipes located to ensure circulation? ü

3 Does the tank have a drain line? ü

4 Does the tank have an overflow line? ü

5 Does the overflow discharge above ground to an open basin or pad terminating with a flap valve or screen? ü

6 Can the tank be isolated from the system and drained? ü

7 Can the tank be by-passed for maintenance? ü

Additional Comments:

FLOOR YES NO COMMENTS

1 Has the tank floor been cleaned? ü Interior bladder system was removed 2 Waterstop type ü Monolithic 3 Floor/wall connection visible? ü

4 Are there any visible cracks on the floor? ü

5 Are there any rough spots or spalls on the floor? ü Spalls near man hole 6 Any accessories or equipment mounted on the floor? ü

7 Is the floor coated? Type of paint? (Condition) ü Interior bladder system was removed 8 Are there any sumps? (size and depth) ü 12" Square x 6" Deep

Additional Comments:

FIELD NOTES

Look Rock Campground Foothills Parkway - Tennessee 37878 U.S. Department of the Interior National Park Service

Side Wall Depth Dome/Open Top Material of Const.

From the tank interior the footer appears to be level and does not show signs of exterior gaps between the wall and the footer.

CROM Job No.

CCR006 - 10/1/2018

EXTERIOR WALL YES NO COMMENTS

1 Are there any cracks? ü

2 Are there spalled areas? ü

3 Are there any exposed prestressing wires? ü

4 Is the wall painted? Type of paint? (Condition) ü Seal Coat Chembond and Finish Coat Inertol Ramuc 5 Are there any hollows? ü

6 Are there any stains on the wall? ü

Additional Comments:

INTERIOR WALL YES NO COMMENTS

1 Are there any hollows? ü Hollow areas along cracks 2 Are there any cracks? ü Cracks in sidewall, floor, and dome 3 Are there stains on the wall? ü

4 Was the wall coated? Type of paint? (Condition) ü Interior bladder. Material is still unknown.

5 Is there a baffle wall? Type of material? (Condition) ü

Additional Comments:

INTERIOR DOME YES NO COMMENTS

1 Can you see dome reinforcing? ü

2 Is there any exposed mesh? ü

3 Are there exposed reinforcement support bolsters? ü

4 Are there any spalled areas? ü

5 Was the dome coated? Type of paint? (Condition) ü

6 Are there stains on the dome? ü Stains from interior bladder sealant

Additional Comments:

EXTERIOR DOME YES NO COMMENTS

1 Are there any chips and spalls? ü Spalls near center vent 2 Are there any cracks? ü

3 Are there any flat spots or humps? ü

4 Positive slope to allow water to drain off dome/roof? ü

5 Are there any attachments to the tank, i.e. antennae, etc? ü Lightning Ground Equipment 6 Is the dome painted? Type of paint? (Condition) ü One coat Chembond. One Coat Inertol Ramuc

Additional Comments:

ACCESSORIES YES NO COMMENTS

1 Exterior Ladder ü

Safety climb device? ü

2 Dome Handrail ü

3 Interior ladder ü

Safety climb device? ü

4 Manhole ü

5 Liquid level indicator ü

6 Hatch cover ü

Raised curb and cover with overhang? ü

7 Overflows ü

Screened, protected from rain? ü

8 Center vent / ventilators ü

Screened, protected from rain? ü

9 Dome probes with curbs? ü 2" pvc probe and cap without a concrete curb 10 Aerator (size) ü

11 Specials ü

Additional Comments:

SITE SECURITY YES NO COMMENTS

1 Is there a fence around the facility with lockable gate? ü

2 Are access hatches locked? ü

3 Are exterior ladders made inaccessible to intruders ü Security gate is only prevention. Tank was open.

4 Is the site remote (no on-site office)? ü

5 Is the site well maintained? ü Overgowth on and around tank. NPS is renovating area.

6 Are there physical features that could damage the tank? ü

7 Potential sanitary hazards? Proximity? ü

(i.e. bird droppings, sewers, standing water, animal activity)

Additional Comments:

FOOTHILLS PKWY, TN - 0.1 MG RESERVOIR 9-10-63